26685665781956 has 6 divisors (see below), whose sum is σ = 46699915118430. Its totient is φ = 13342832890976.

The previous prime is 26685665781941. The next prime is 26685665781979. The reversal of 26685665781956 is 65918756658662.

It can be written as a sum of positive squares in only one way, i.e., 15553873945600 + 11131791836356 = 3943840^2 + 3336434^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3335708222741 + ... + 3335708222748.

It is an arithmetic number, because the mean of its divisors is an integer number (7783319186405).

Almost surely, 2^{26685665781956} is an apocalyptic number.

It is an amenable number.

26685665781956 is a deficient number, since it is larger than the sum of its proper divisors (20014249336474).

26685665781956 is a wasteful number, since it uses less digits than its factorization.

26685665781956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6671416445493 (or 6671416445491 counting only the distinct ones).

The product of its digits is 7838208000, while the sum is 80.

The spelling of 26685665781956 in words is "twenty-six trillion, six hundred eighty-five billion, six hundred sixty-five million, seven hundred eighty-one thousand, nine hundred fifty-six".